Disable invariant load hoisting temporarily

With invariant load hoisting enabled the LLVM buildbots currently show some
miscompiles, which are possibly caused by invariant load hosting itself.
Confirming and fixing this requires a more in-depth analysis. To meanwhile get
back green buildbots that allow us to observe other regressions, we disable
invariant code hoisting temporarily. The relevant bug is tracked at:

http://llvm.org/PR28985

llvm-svn: 278681

polly/lib/Analysis/ScopDetection.cpp

@@ -176,7 +176,7 @@ bool polly::PollyInvariantLoadHoisting;
 static cl::opt<bool, true> XPollyInvariantLoadHoisting(
     "polly-invariant-load-hoisting", cl::desc("Hoist invariant loads."),
     cl::location(PollyInvariantLoadHoisting), cl::Hidden, cl::ZeroOrMore,
-    cl::init(true), cl::cat(PollyCategory));
+    cl::init(false), cl::cat(PollyCategory));
 
 /// @brief The minimal trip count under which loops are considered unprofitable.
 static const unsigned MIN_LOOP_TRIP_COUNT = 8;